Dark Mode Behaviour [Windows]

[jamiedougal]

We have a standalone SWT application, and are trying to get dark model to work under windows.

We are using Java 21, SWT 4.37. Under OSX dark mode works as expected - under Windows it displays as if it were light mode.

Calling OS.setTheme(true) at the start will shift the title bar to dark mode, but no other controls. Reviewing other forums and tickets, we have seen calls setting various win32 properties at startup, to no effect. Seeing that the call to OS.IsDarkModeAvailable returns false, we have used reflection to tweak the properties that depend on that to be true.

The only workaround seem to be manually setting the colours during the SWT.Skin event. Is there another way that we are missing to open in dark mode under windows?

Thanks.
Jamie

DarkMode.java

[HeikoKlare]

To the best of my knowledge, SWT does not provide any integrated theming support and the Win32 controls of Windows do not support native theming either. This is why the Eclipse Platform has its own theming implementation, which basically just sets colors and other properties of the controls. So would have to manually do it for a pure SWT application on Windows.